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Chapter-Wise Tips & Tricks

Master JEE with expert shortcuts, memory techniques, and problem-solving strategies from IIT toppers.

Physics - Class 12th Tips & Tricks

Electric Charges and Fields

15 Tricks Memory Tips
  • Quick Coulomb: Use k = 9×10⁹ instead of 1/4πε₀ for faster calculations
  • Sign Trick: Like charges repel (positive), unlike attract (negative)
  • Unit Conversion: 1 μC = 10⁻⁶ C, memorize common charge values
  • Symmetry Shortcut: Use symmetry to cancel components in vector addition
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Electrostatic Potential

12 Tricks Formula Hacks
  • Potential Formula: V = kQ/r (remember: no vector, it's scalar!)
  • Work Done Trick: W = q(V₂ - V₁) - sign determines direction
  • Infinite Potential: V at infinity = 0 (reference point)
  • Equipotential: No work done moving on equipotential surface
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Current Electricity

20 Tricks Circuit Hacks
  • Series Trick: Current same, voltage divides: V = IR
  • Parallel Hack: Voltage same, current divides: 1/R_eq = 1/R₁ + 1/R₂
  • Kirchhoff's Laws: Loop rule (voltage), Junction rule (current)
  • Power Formulas: P = VI = I²R = V²/R - use smartest one
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Ray Optics

18 Tricks Sign Convention
  • Mirror Formula: 1/f = 1/v + 1/u - NEW Cartesian convention
  • Sign Trick: All measurements from pole, left is -ve, right is +ve
  • Lens Power: P = 1/f (in meters) - concave is -ve, convex is +ve
  • Magnification: m = -v/u = h'/h (negative = inverted)